Решите уравнение (7-2х)(х+3)=0
(7х-2х)(х+3)=х
(7-2х)(х+3)=5(х+3)
(3-2х)(5х-3)=0
(3-2х)(5х-3)=2х^2
(4х-5)^2-(2х+3)^2=3х-1